No one is trying to change the system, he's trying to work within the system.... Mueller is NOT a LAW BREAKER.... t's a real shame you seem to think he is.....he's accused someone and now doesn't want to show the evidence.
He can work within the system, if it is necessary to hide their source....he can drop the indictment, if he feels it is necessary and there is no other way around keeping sources and methods that he is still using in his investigation that he does not want to reveal.
Why are you all so HAPPY about all of this....?